Type-writing machine.



No. 855,011. \PATENTED MAY 23, 1907.

' F. LEAR.

TYPE WRITING MACHINE.

APPLICATION FILED MAR. 30,1907.

Wifngses= Jim/anion- 16. Arthu'rELeax UNITED STATES PATENT O I E.

ARTHUR .F. LEAR, 'OF NEWYORKI'N. Y.-, AssIeNOR' To LUNDERWOOD TYPEWRITERCOMPANY, 1 OF NEWYORK, N. Y., A CORPORATION or NEW JERSEY.

TYPE-WRITING MACHINE.

Patented Ma as, 1907. v

Application filed Maroh 30,1907. serial No. 365,563

To all whom) it mag concern:

Be it known that I, ART UR F. LEAR, a

citizen of the, United States, residing in themitting sight endwiseshake of, the platen in the frame, which is highly objectionable.

It has also been foundimpracticable owing to unavoidable inaccuracies inmanufacture, to

securean exact fit between the platen and the ends. of the. frame,except by going throu h the process of grmdingoff the end'of the p atenhub after the parts have been manufactured and are ready to assemble.-

. In many cases the platen itself, which cons'ists of a tube of rubberplaced upon a wooden core, alters in length after it is manufactured,sothat it will not fit accurately be-- tween the ends of the platenframe. For these and other reasons, it is the common. practice to makeplatens a trifle over size and then to fitthem into the platen frame bygrinding the platen hubs, which is a slow and hand head 13 has a similarhub '17 throughexp ensive process. I

he object of the present inventlon is to provide simple, inexpensive andsatisfactory means for securing an accurate fit of the platep in thelaten frame. v

To this en I place upon one of the platen hubs a device in the form of aferrule which fits closely upon the hub, and is adjustable axially withthe efiect of lengthening or. shortening the hub, as may be-desired; the

end of said ferrule contactin with the bearing or journal whichis rovied in the platen frame; so that any sha eor loose'ness of the platen inthe platen frame is readily taken up.v Y I also'provide means for firmlysecuring theferrule wherever it .is'adjuste'cl. I e

1 In the accompanying drawings, Fi ure 1 is a perspective 'vle'w of aplaten'provi ed'.with my improvements. Flg. .2 is; an end view thereofshowing the platen axle in section.

3 is an enlarged perspectiv how;

ing aportion of the platen hub insection,

and also showing the 0 en "end of'the ferrule".

in position thereon, an the platen axle ass -1ng through the hub and theferrule;

. 4 1s a sectional view illustrating the manner of ing illustrated asadjusted to the right as far as-it will go. Fig. '5 is a part sectionalplan of a platen frame of an Underwood type writing machine providedwith my improvements; the ferrule bein shown as adjusted Fig. 6 is apart sectional view Of the right hand endof a laten and platen frame,and is similar to to the left as far as it wil go.

ig. 5, exceipt that the platen has-been given a quarter 0 a revolutionfrom the Filgifi positlon, so as to show the set screws W 'ch sccurethe-ferrule upon the hub of the platen.

In the Underwood typewriting machine, types 1 strike upon thefrontside'of a platen 2 which is secured uponan axle 3, the latter mounted injournals or bearings 4 in the ends 5, 6, of a platen frame, which alsocomprises a rear plate or paper shelf 7. The'axle 3 projects outsideofthe platen frame and carries hand wheels 8, ,wh ch are 'releasably secured by set screws 9. v

The laten usually comprises a wooden core 10 aving a rubbersheath 11.Metallic heads 12 and 13 are secured upon the core 10 by screws 14. Theleft hand'head12 has .a hub, 15 through which passes a setscrew 16 tosecure the hub to the, axle. The right which passes a similar screw 18,both hubs bein usuallyeecu-red to the platen axle 3. It Wlll beunderstood, that when it is desired to remove the laten, it is onlynecessary to securing the hub to the axle; the ferrule beloosen one of te screws 9 and both of the screws 16 and 18, whereupon the axle, which.passes through the hubs and through the bearin s 4 can be pulled out ofthe machine, thus re easing the platen. I Upon the right hand hub 17 isshown afferrule 19 which'fits closely upon the hub and is adjustableaxially thereon. Theclosed end 19 of the ferrule is intended to beardirectly a ainst the bearing or journal 4, which is usua y in the formof a boss riveted upon ,the end of the platen frame. 1", l When theplaten has been inserted in the platen frame, the ferrule 19 is adjustedalong the hub 17 to'take up the endwise play of the fixed bosses 4,while the hub at the other end of the platen bears against the otherfixedboss 4., so that the platen cannot shake.

Thereupon set screws threaded into the ferrule are turned in to bearagainst the periphery of the hub, as at Fig. 5, thereby claim:

firmly securing the ferrule Where it has been adjusted.

The ferrule has a longitudinal slot 21 to receive the shank of the screw18, said slot permitting the described adjustment of the fe'r-. ruleinde endently of said screw 18.

It will e observed that the ferrule affordsinexpensive and readilyapplied means for taking up endwise play of the platen, and that I.avoid the necessity of repeatedly removing the platen from the 'machinefor grinding the end of the platen hub and replacing it in the machinefor a test until an exact fit is secured. A precise fit of any platen inany suitable platen frame may be secured by a moments mani ulation afterthe platen is placed in the mac ine.

When the platen is removed, the adjustment of the ferrule thereon is notdisturbed, so that the platen can be immediately put back and securedwithout'the necessity of refitting or rel-adjusting of parts.

Having thus described my invention, I

1'. In a typewriting machine, the coinbina tion with a frame havingends, each provided with a bearing, of a laten having heads, an axlepassing throng said heads and journaled ;in said bearings and havingfingerwheels attached thereto outside of said platen frame, one of saidheads being provided with an exterior hub, a device in the form of aferrule fitting upon said hub and. adjustable axially to take uplongitudinal play of the platen between said'bearings, and means tosecure said ferrule to the hub at various adjusted positions, the platenbeing removable from the frame by withdrawing the axle, and the f crrulebeing removable with the platen with- .axle passing throug outdisturbing the adjustment of the ferrule on the platen.

2. In a typwriting machine, the combination with a frame having ends,each provided with a bearing, of a )laten having heads, an

said heads and journaled in said bearings and having fingerwheelsattached thereto outside of said platen frame, one of said heads beingprovided with an exterior hub, a device in the form of a ferrule fittingupon said hub and adjustable axially to take .up longitudinal play ofthe platen betweensaid bearings, means to secure said ferrule to the hubat various adjusted positions, and a screw threaded into said hubtosecure it to said axle; said ferrule having a slot for said screw, theplaten being removable from the frame by withdrawing the axle, and theferrule being removable with the platen without disturbing theadjustment of the ferrule on the platen.

3. In a typewriting machine, the combination with a frame having ends,each provided with a bearing, of a platen having heads, an i axlepassing throng said heads and journaled in said bearings and havmgfingerwheels attached thereto outside of said platen .frame, one of saidheads being provided with an exterior hub, a device in the form of aferrulefitting upon said hub and adjustable axiallyto take ulongitudinal play of the platen between sai bearings, set screwsthreaded into said ferrule to bear against the periphery of said hub andlock the ferrule upon the hub, and a screw threaded into said hub tobear ,upon said axle; the ferrule being slotted to receive the shankof'the last-mentioned screw, the platen being removable from the frame bywithdrawing the axle, and the forrule being removable with the platenwithout disturbing the adjustment of the ferrule on the platen. I

ARTHUR F; LEAR.

. itnesses:

Ki'r'iin FRANKron'r, (LARA RIPLEY.

